Chock full of Tactics and Subtle Threats.

Heh, felt like a dozen times I wanted white to play Nc3 or 0-0.  I guess he wanted to blow you away with aggressive moves.

On d5 I thought he had you :)  12.Qa4 seems hard to meet though.

14.dxc6 was a blunder, black has tons of initiative now.

Wouldn't expect you to see 18...Rd6 works tactically, well done ;)

What is the importance of 18..Rd6?

It creates a pin, gaining a tempo, as well as letting the queen come in and attack the bishop. Just that little bit of pressure that black can't handle. It force wins a piece in about 4 moves because white can't do enough things at once.